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Definitive data vs AUTODIF measurements at Kakioka Magnetic Observatory |
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Rasson, J. (1), Gonsette, A. (1), OKAWA, T. (2), OWADA, T. (2), OGI, J. (2), KAITOH, M. (2) |
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(1) Institut Royal Meteorologique Centre de Physique du Globe, Dourbes 5670, Belgique (2) Japan Meteorological Agency Kakioka Magnetic Observatory, Kakioka, Japan |
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Declination and inclination measurements made by AUTODIF are absolute in the sense that they are referred to True North and the local Vertical and are not dependent upon instrumental misalignments. These absolute measurements can be made frequently, up to 48 times/day. Therefore it is interesting to compare with the definitive data of the observatory where AUTODIF is measuring. We performed such comparison in the Kakioka Magnetic Observatory which has the IMO status (see www.intermagnet.com). The definitive data at the times of the AUTODIF absolute were extracted from the INTERMAGNET database and intercompared. Aditionally we extracted the biaxial tilt from the AUTODIF to monitor the long-term loss of levelling; also the evolution of AUTODIF horizontal circle index with respect to the target direction was monitored for getting information on possible AUTODIF micromotions in the horizontal plane. We present these results and make some tentative conclusions. |
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Measurements |
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oral |
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